If you just contact network monitor, you will find network monitoring products
much more complex than the traditional monitoring, the difference is very big,
the product doesn't know how to choose. YiErSen suggestion is to buy only - not
blindly buy expensive, also don't blindly to buy cheap.
First of all, we must make clear the project needs, wan monitoring or LAN
monitoring? How many road image? On the image definition and fluency
requirements? If need to monitor multiple images? If you need on TV wall? Then
the front-end and understanding, even after the bandwidth of the project budget,
finally understand and choose to design good product.
First need to remind everybody, network monitor product belongs to the
software and hardware products, and combining the importance of software system,
higher. So the product inspection from two aspects of hardware and software.
Main hardware
A, the picture quality
The quality is clear, the image is monitoring. But for graphics,
quantifiable parameter only "resolution", the most common of which are: D1 (704
x), Half D1 (576), CIF 704 x 288 288 352 (x), but the only representative pixel
value, almost every brand resolution parameters are same, so don't differentiate
by the resolution of the image quality, quality levels, colour, noise, can use
parameter, the key depends on good in quality video encoding chip coding,
PHILIPS coding quality graphics chips, if not clear is the best use of what
encoding chip, then must "seeing is believing.
In addition, network video monitoring the quality product is adjustable,
different quality of different level of bandwidth. So the client should be in
the same bandwidth, or situation comparison at the same quality situation
comparison bandwidth.
Second, double stream function
So-called double stream function, is a device can also produce two yards.
Local video, can use high streaming video, in order to ensure the quality,
Remote monitoring, can choose low streaming, in order to obtain a low bandwidth
environment monitoring of the smooth effect.
This function can be both clear video effects and remote monitoring of
fluency, bandwidth limited environment, particularly valuable.
Three, and bandwidth requirements
In domestic bandwidth resources are limited, it has become the bottleneck
of network monitoring. So choose low bandwidth rate of network monitoring
products, appear particularly important.
Bandwidth depends mainly on network monitor product compression. Mainly M
- JPEG, mpeg-4 h.264, these three, M - JPEG belong to product of amateurs,
bandwidth, generally considered very badly. Mpeg-4 currently use morer, because
the price of h.264 cheaper. While h.264 in the same quality situation, bitrate
is about to mpeg-4 70%, of course, some high cost will be compressed chips.
In addition, even the same way, different manufacturers compressed
code-rate also exist obvious difference, such as the h.264 compression standard
has many rules, each manufacturer can simplify part rules to reduce cost, but
also the image compression efficiency by corresponding impact.
It has been said, bandwidth and is proportional to the quality of
products, and so on, if the nominal parameter ZhanYongLiang bandwidth, must
indicate based on what ever known, graphics and resolution is completely
meaningless. The customer must at the same quality situation comparison
bandwidth.
Four, audio transmission
Network monitor product often comes the audio transmission function, some
functions, unidirectional audio monitor, not only the intercom. Support to
support the two-way voice monitoring and the intercom.
Five, mobile detection
The motion detecting means, when the pictures have change, if someone
walked, the system can automatically make corresponding processing. Should be
able to set time, detection of protection removal, the detection sensitivity.
When triggered, when should linkage video camera linkage alarm output, linkage
to the corresponding preset.
Six, video
The advance in the mean, video recording, mobile detection system will
trigger the dozens of seconds before from the start, the function of video ahead
very useful, let you don't miss the timing of the video.
Seven, dynamic DNS
Dynamic DNS function is to solve the problem, the dynamic IP monitoring
for bringing dynamic DNS function of network monitoring products, use rise more
convenient, independent of the router.
Eight, PPPOE
PPPOE is automatic dial-up function, the function, the router will not
meet MODEM network cameras can use directly.
Main software index
A, multi-channel image management
For medium and network monitoring system, need to understand the software
can manage multiple images at most, whether can support group, automatic packet
switching, and management is convenient.
Second, a key login
For much of the project, the image and image how to open? One is, or by a
key can open all the way? If no one key in open login, multiple image will be
very troublesome.
3 and remote view video
Most software can only in the computer video footage, and functional view
of software can also be set into video server machine, let others can see the
video data remote machine, greatly facilitate customers, it is also necessary
large-scale network monitor system function, because as a video footage of
computer is used only for the server, and other video computer monitor, the
replay.
Four, data forwarding
Data is transmitted through the computer software to monitor delivery
server, allowing others to visit this computer, monitor, and indirectly image to
save the bandwidth of the front, let more people and visit. When the choose and
buy please note.
Five, active/passive mode of operation
General software only active mode, let the monitoring center forward. The
equipment, While still has good software functions of passive mode, let
front-end equipment to monitor center data, since such, no matter what is in
front of Internet, can direct way, do not use dynamic DNS and port mapping. Past
district broadband, cable TV broadband IP address and Internet users, cannot use
network monitoring and passive mode, and gave them the network monitoring
provides the perfect solution.
Six, high-speed ball support
General software support yuntai lens, but not necessarily can improve
control to support high-speed ball control, such as whether to adjust speed,
setting preset position, when the choose and buy, track cruising attention,
please.
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